Why do some of the control kits come with safety switches?
Not all furnaces or boilers have safety switches on them, in case of a flue gas spillage or a flame roll out you would want a means of shutting down the appliance. That is one of the reasons we put the safety spill switches into some of the control kits. The spill switches also give you another safety in case something goes wrong with the power venter and pressure switch.
